J
Johann W. Kolar
Researcher at ETH Zurich
Publications - 1009
Citations - 44219
Johann W. Kolar is an academic researcher from ETH Zurich. The author has contributed to research in topics: Rectifier & Three-phase. The author has an hindex of 97, co-authored 965 publications receiving 36902 citations. Previous affiliations of Johann W. Kolar include Alstom & Infineon Technologies.
Papers
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Journal ArticleDOI
Optimization of Phase Change Material Heat Sinks for Low Duty Cycle High Peak Load Power Supplies
TL;DR: In this paper, the authors used the thermal resistors and capacitors (RCs) network approach to model and optimize a hybrid air-cooled heat sink with phase change materials (PCM) to achieve maximum possible temperature reduction for a given application.
Proceedings ArticleDOI
Minimizing the current harmonics RMS value of three-phase PWM converter systems by optimal and suboptimal transition between continuous and discontinuous modulation
TL;DR: In this paper, a three-phase PWM converter system with two bridge legs is considered, where the third bridge leg is clamped to the positive or negative DC link voltage.
Proceedings ArticleDOI
Characterization of the Voltage and Electric Field Stresses in Multi-Cell Solid-State Transformers
TL;DR: In this article, the authors analyzed the voltage stresses appearing in cascaded converters, employing converter cells based on two-level or three-level bridge legs, and showed that the highest electric fields occur in medium-frequency transformers of the converter cells' DC-DC converters.
Journal ArticleDOI
Cooling Concepts for High Power Density Magnetic Devices
Juergen Biela,Johann W. Kolar +1 more
TL;DR: In this article, an indirect air cooling system for magnetic devices which combines the transformer with a heat sink and a heat transfer component is presented and an analytic approach for calculating the temperature distribution is derived and validated by measurements.
Journal ArticleDOI
A Three-Phase Delta Switch Rectifier for Use in Modern Aircraft
TL;DR: It is shown that the three-phase -switch rectifier (comprising three -connected bidirectional switches) is well suited for this application and a novel PWM current controller modulation concept is presented, where all three phases are controlled simultaneously.